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Development of plasma stored energy feedback control and its application to high performance discharges on JT-60U

Authors :
Y. Kawamata
T. Oikawa
K. Kurihara
T. Fukuda
K. Tsuchiya
Takaaki Fujita
Yuzuru Neyatani
Source :
Fusion Engineering and Design. 70:175-183
Publication Year :
2004
Publisher :
Elsevier BV, 2004.

Abstract

The real-time feedback control of the plasma stored energy has been developed for control of the plasma MHD stability in the JT-60U tokamak. The plasma stored energy can be detected with high accuracy in real-time by a function parameterization method for various plasmas available in JT-60U, such as Ohmic plasmas, the L-mode, the H-mode, the high poloidal beta mode and the reversed shear mode over a wide range of the plasma parameters. By manipulating the neutral beam injection power, the plasma stored energy has been successfully controlled along the preprogrammed reference waveform. Especially in the reversed shear mode, this feedback control scheme has improved the reproducibility of the formation of the internal transport barrier, and MHD activities could be suppressed keeping the normalized beta in a stable region. A DT equivalent fusion amplification gain of 0.5 was sustained for 0.8 s in a reversed shear plasma by employing this feedback control scheme.

Details

ISSN :
09203796
Volume :
70
Database :
OpenAIRE
Journal :
Fusion Engineering and Design
Accession number :
edsair.doi...........63340fb145da1ca1d14f9867a1300918